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Light sampling behaviour regulates circadian entrainment in mice.

Laura C E Steel1, Shu K E Tam2, Laurence A Brown3

  • 1Sir Jules Thorn Sleep and Circadian Neuroscience Institute (SCNi), Kavli Institute for Nanoscience Discovery, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK.

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Mice in a new nestbox setup significantly reduced light exposure, demonstrating light environment sampling behavior. This behavior is controlled by circadian rhythms, highlighting behavior's role in natural light cycles.

Keywords:
BehaviourCircadian ecologyCircadian rhythmCryptochromeLight samplingNestboxPhotoentrainment

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Area of Science:

  • Chronobiology
  • Animal Behavior

Background:

  • Natural light environments are complex and differ significantly from laboratory settings.
  • Burrowing species like mice exhibit light environment sampling behavior to self-modulate light exposure.
  • Laboratory mice have limited opportunities to engage in this natural behavior.

Purpose of the Study:

  • To introduce a nestbox paradigm enabling mice to self-modulate their light environment.
  • To investigate locomotor activity, circadian entrainment, decision-making, and light environment sampling behavior in mice.

Main Methods:

  • Utilized dark nestboxes equipped with passive infrared sensors.
  • Monitored mouse activity, circadian entrainment, and light exposure patterns.
  • Introduced a ramped light-dark cycle to observe behavior.

Main Results:

  • Mice significantly reduced light exposure to an average of 0.8 hours per 24-hour period.
  • Observed distinct light environment sampling behavior with peaks at dawn and dusk.
  • Demonstrated that light environment sampling timing is dependent on endogenous circadian rhythms and abolished in arrhythmic mice.

Conclusions:

  • Behavior plays a crucial role in modifying light signals for circadian entrainment under natural conditions.
  • Findings emphasize the importance of considering naturalistic behaviors in laboratory studies of circadian rhythms.